diff --git a/solver.hpp b/solver.hpp
index d5ba097..c1bcf6f 100644
--- a/solver.hpp
+++ b/solver.hpp
@@ -61,7 +61,7 @@ public:
 		for(int col = 0; col < known.M; col++) {
 			int possible_count = 0;
 			for(int n : positions_of_colors[col])
-				if(known.possible[n][col])
+				if(known.can(n, col))
 					possible_count++;
 			if(possible_count == 0 && positions_of_colors[col].size() > 0)
 				known.empty_color(col);
@@ -69,11 +69,8 @@ public:
 	}
 	void here(vector<int> guess) {
 		for(int n = 0; n < known.N; n++)
-			if(guess[n] > -1 && known.possible[n][guess[n]])
-				for(int col = 0; col < known.M; col++) {
-					if(col != guess[n])
-						known.possible[n][col] = 0;
-				}
+			if(guess[n] > -1 && known.can(n, guess[n]))
+				known.must_be(n, guess[n]);
 	}
 	void not_here(vector<int> guess) {
 		for(int n = 0; n < known.N; n++)
@@ -105,7 +102,7 @@ public:
 		// Get number of colors, that can be on their positions
 		int possible_count = 0;
 		for(int n = 0; n < known.N; n++)
-			if(guess[n] > -1 && known.possible[n][guess[n]])
+			if(guess[n] > -1 && known.can(n, guess[n]))
 				possible_count++;
 
 		// None of these colors are there